Question

The functional megaspore undergoes [CPMT 1986]
A) 2 meiotic divisions to form mature embryo sac B) 3 mitotic divisions to form mature embryo sac C) 2 mitotic divisions to form mature embryo sac D) 3 meiotic divisions to form mature embryo sac

Answer 1

Explanation:

two mitotic divisions

Develops from one of the two dyads formed as a result of the first meiotic division (Meiosis I) of Megaspore Mother Cell. Both the nuclei of the functional dyad take part in the formation of embryo sac. Each nucleus undergoes two mitotic divisions and the mature embryo sac is 8 nucleated.

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Answer 2

Explanation:

The megaspore mother cell undergoes meiosis to give rise to 4 haploid cells. Three haploid cells degenerate and 1 survives to become the embryo sac. The embryo sac enlarges in size and the haploid nucleus undergoes mitosis to form 2 haploid nuclei. The two haploid nuclei further undergo mitosis to form 4 haploid nuclei within the embryo sac. In the final round of mitosis 8 haploid nuclei are produced. Hence the functional megaspore undergoes 3 mitotic divisions to form mature embryo sac. Thus the correct answer is option B.